- Kohai
- A student who started practice after you
- Kokyu
- Centering with controlled breathing
- Kokyu dosa
- An exercise to develop your ki/breath power without using strength, often done in a kneeling position
- Kokyunage
- Breath Throw. A cover-all term used to refer to a series of blending techniques with no common mechanical similarities and also for more unusual techniques without commonly accepted names.
- Ku
- Nine
- Maai
- Distance between partners
- Mae
- Move to the front; move forward
- Migi
- Right
- Mokuso
- To meditate
- Morotetori
- Both; two-hand grab
- Nage
- Partner leading the movement of the technique
- Nana
- Seven; also shichi
- Ni
- Two
- Nikkyo
- Second pinning technique
- Omote
- Move forward
- Onegai shimasu
- Please practice with me
- Rei
- Bow
- Reigi
- Proper dojo etiquette
- Ritsurei
- Standing bow
- Roku
- Six
- Ryo
- Both (hands or wrists)
- San
- Three
- Sankyu
- Third pinning technique
- Shichi
- Seven
- Seiza
- Kneeling seated position
- Sempai
- Senior student who started practice before you
- Sensei
- Teacher or instructor
- Shi
- Four
- Shihan
- Honorary title awarded to some of the highest ranking teachers; master teacher
- Shihonage
- Four directions throw
- Shikko
- Knee walking
- Shomen
- Front of the dojo where the picture of O'Sensei is
- Shomen uchi
- Forward strike straight down on the head
- Soto
- Out or outside, movement outside of Uke's arm
- Suwari waza
- Techniques done with both Nage and Uke in a kneeling position
- Tanto
- Wooden practice knife
- Te
- Hand
- Tekubi
- Wrist
- Tenkan
- Turning movement
- Tenchi
- Heaven and earth
- Tenshin
- Stepping backwards off the line of attack
- Tsuki
- Punch to the belt or chest
- Uchi
- Inside movement, inside or under Uke's arm
- Uke
- Partner following the movement of the technique
- Ukemi
- Falling
- Ura
- Move to the back
- Ushiro
- From behind
- Ushiro Kubishime
- Attacking from behind, grabbing one hand and performing a single collar choke with the other hand.
- Ushiro Ryokata-tori
- Double shoulder grab from behind.
- Ushiro Ryokatate-tori
- Two handed grab of the wrists from behind
- Yame
- To end
- Yokomen uchi
- Diagonal strike to the side of the head
- Yonkyo
- Fourth pinning technique
- Zanshin
- Unbroken concentration, the "follow through" of a technique
- Zarei
- Seated bow
One of many sites you can check for additional definitions is: http://www.stenudd.com/aikido/aikido-glossary.htm